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Assertion : The first ionisation energy of aluminium is lower than that of magnesium.Reason : The ionic radius of aluminium is smaller than that of magnesium(a) Both A and R are true and R is the correct explanation of A (b) Both A and R are true but R is not correct explanation of A (c) A is true but R is false (d) A and R are false |
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Answer» Correct option (b) Both A and R are true but R is not correct explanation of A Explanation: The elements of group III have ns2 np1, configuration. Since p-electrons are held less tightly than s-electrons. The first IE of group III element is low as compared to the first IE of alkaline earth metal. |
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